JP7295468B2 - Nuisance Call Countermeasure Device, Nuisance Call Countermeasure Method, and Nuisance Call Countermeasure Program - Google Patents

Description

The present invention relates to a nuisance call countermeasure device, a nuisance call countermeasure method, and a nuisance call countermeasure program.

Conventionally, countermeasures against nuisance calls such as special frauds have been considered. Non-Patent Document 1, in “III. Disclosed is a technique for telling a caller to press the 8th key before ending the call if the call with the caller is evaluated as annoying, and to press the 9th key otherwise. do.

Y. Rebahi, et al., “SIP Spam Detection”, ICDT’06, IEEE, August 2006, <URL: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=16985151>

However, if the billing amount is one dollar, the effect of deterring nuisance calls is small. Also, if the recipient agrees to the contract during the call, there is a possibility that the recipient will not be evaluated as a nuisance call by telling the recipient to press the number 9 key.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of preventing nuisance calls and fraudulent calls.

A nuisance call countermeasure device according to one aspect of the present invention provides a phone terminal of a caller with a probability of being evaluated as nuisance or fraud when the call of the caller is evaluated as nuisance or fraud by the recipient. and a response unit for transmitting a response requesting an amount charged to the recipient, if the caller requests a call to the recipient in response to the response, after the call between the caller and the recipient is terminated. a notification unit that notifies the telephone terminal of the above of a request to return an evaluation result of evaluating the call with the caller; and a determination unit that determines an amount of money according to the probability of being evaluated as nuisance or fraud as a billing amount.

According to one aspect of the present invention, there is provided a nuisance call countermeasure method implemented by a nuisance call countermeasure device, wherein the nuisance call countermeasure device informs the caller's telephone terminal that the caller's call is an annoyance to the recipient. or delivering a response that, if evaluated as fraud, charges an amount commensurate with the probability of being evaluated as nuisance or fraud; after the call between the caller and the recipient is completed, notifying the telephone terminal of the caller of a request to return an evaluation result of evaluating the call with the caller; and determining, as a billing amount, an amount corresponding to the probability that the call with the caller is evaluated as annoying or fraudulent.

One aspect of the present invention is a nuisance call countermeasure program that causes a computer to function as the nuisance call countermeasure device.

ADVANTAGE OF THE INVENTION According to this invention, the technique which can suppress a nuisance call and a fraudulent call can be provided.

FIG. 1 is a diagram showing the overall configuration of the anti-nuisance call system. FIG. 2 is a diagram showing the configuration of the anti-nuisance call device. FIG. 3 is a diagram showing a processing sequence of the anti-nuisance call system. FIG. 4 is a diagram showing the hardware configuration of the anti-nuisance call device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals, and the description thereof is omitted.

[Summary of Invention]
The present invention is characterized by converting the risk associated with the caller and the evaluation of the content of the call into an index that is easy for the recipient to understand, such as the amount of money. At this time, the present invention sets the amount according to the probability of being evaluated as nuisance or fraud, instead of the conventional low and fixed amount (1 dollar).

In addition, the present invention is based on the fact that whether or not to make a call is not on the side of the recipient, where there are many people with relatively low information literacy who receive nuisance calls and fraudulent calls, but on the side of the caller, where there are many people with relatively high information literacy who make frequent calls. It is characterized by letting (especially fraudsters) make judgments. Specifically, the present invention conveys to the caller a response that charges an amount according to the probability of being evaluated as nuisance or fraud, and in response to the response, the caller requests a call to the recipient. determine the amount to be charged. At this time, the present invention returns the evaluation result of evaluating the call with the caller to the caller after the end of the call between the caller and the callee, not during the conventional phone call. Notify request.

For example, when a caller makes a call, the present invention analyzes the risk of the caller ID based on the header information such as the caller ID, the past call history, the evaluation of the caller ID, and the like. The amount of money is determined, the caller is notified that the call will be charged if the call is evaluated as troublesome or fraudulent by the receiver, and the receiver is made to input the evaluation of the call after the call is finished. As a result, the higher the risk, the higher the billing amount can be set, and the deterrence of nuisance calls to the caller side can be enhanced. Recipients can expect correct evaluations without gaining unfair advantage. Telephone companies can improve and expand the services provided by charging fees collected from callers, and further spread of services can be expected.

[Overall configuration of anti-nuisance call system]
FIG. 1 is a diagram showing the overall configuration of an anti-nuisance call system 1 according to this embodiment. The nuisance call countermeasure system 1 can be implemented using an existing telephone communication network provided by a telephone company. , a telephone terminal 14 on the recipient side, and a SIP server 15 on the recipient side.

The anti-nuisance call device 11 is physically and electrically communicably connected to the SIP server 15 on the recipient side. The anti-nuisance call device 11 can be realized by a computer having a CPU, a memory, a communication interface, etc., and is built inside the computer.

The telephone terminal 12 on the sender side and the telephone terminal 14 on the recipient side have, for example, a voice call function, a short message service (SMS) function, an e-mail function, a web browser function, a data input function, a data display function, and a wireless communication function. , smartphone terminals, tablet terminals, mobile phones, etc. equipped with wired communication functions.

The SIP server 13 on the sender side and the SIP server 15 on the receiver side are call processing servers that process call connections between telephone terminals in the existing telephone communication network provided by the telephone company.

[Configuration of anti-nuisance call device]
FIG. 2 is a diagram showing the configuration of the anti-nuisance call device 11 according to this embodiment. The nuisance call countermeasure device 11 includes, for example, a response unit 111, a notification unit 112, a processing unit 113, a determination unit 114, a transmission unit 115, and a storage unit .

If the caller's call is evaluated as annoying or fraudulent by the recipient, the response unit 111 charges the telephone terminal 12 of the originator for an amount corresponding to the probability of being evaluated as annoying or fraudulent. Equipped with a function to convey

When the caller requests a call with the receiver in response to the response, the notification unit 112 sends the caller and It has a function to notify a request to return the evaluation result of evaluating the call.

The processing unit 113 has a function of storing the evaluation result from the recipient in the storage unit 116 . For example, the processing unit 113 performs a data processing process (analysis process) or the like for accumulating receiver evaluation results such as nuisance, fraud, and normality for each sender ID and each receiver ID. Note that the ID is the telephone number of the telephone terminal.

If the call with the caller is evaluated as a nuisance or a fraud in the evaluation result from the recipient, the determination unit 114 determines whether the recipient's evaluation result data stored in the storage unit 116, the reception set in advance in the storage unit 116 data of the amount of damage caused by the caller, data of the issuance cost of the caller ID, past call history stored in the storage unit 116, and other various data input to the nuisance call countermeasure device 11 or acquired by the nuisance call countermeasure device 11 from other servers. It has a function of determining an amount to be charged according to the probability of being evaluated as nuisance or fraud.

The transmission unit 115 has a function of transmitting the determined billing amount together with the caller ID to the recipient's SIP server 15, billing server, or the like.

The storage unit 116 receives evaluation result data relating to the evaluation result returned from the receiver, damage amount data of the receiver, caller ID issuance cost data, past call history, and other information necessary for determining the billing amount. It has a function to readably store various data that has been processed according to the requirements.

[Processing of nuisance call countermeasure system]
FIG. 3 is a diagram showing a processing sequence of the nuisance call countermeasure system 1. As shown in FIG.

step S1 to step S2;
A caller (scammer) calls the intended recipient to commit fraud. At this time, the telephone terminal 12 on the caller side transmits a communication request to the SIP server 13 on the caller side, and the SIP server 13 on the caller side transfers the communication request to the SIP server 15 on the receiver side.

step S3 to step S4;
The SIP server 15 on the recipient side refers to the recipient ID included in the communication request and determines whether or not the recipient ID is included in the anti-nuisance call contractor list. If the recipient ID is included in the anti-nuisance call contractor list, the recipient's SIP server 15 transfers the communication request to the anti-nuisance call device 11 . On the other hand, if the recipient's ID is not included in the list of contractors for anti-nuisance calls, the SIP server 15 on the recipient's side transfers the call request to the telephone terminal 14 on the recipient's side.

Step S5;
When receiving a communication request, the nuisance call countermeasure device 11 refers to the caller ID and the recipient ID included in the communication request, and determines whether the caller ID is included in the whitelist of the recipient ID. judge. If the caller ID is not included in the whitelist of the recipient ID, the nuisance call countermeasure device 11 (determining unit 114) determines a possible billing amount for the caller. For example, the nuisance call countermeasure device 11 determines the amount according to the probability that the caller's call is evaluated as nuisance or fraud by the recipient, instead of the conventional low and fixed billing amount ($1). A method for determining the amount will be described later. On the other hand, if the caller ID is included in the whitelist of the recipient ID, the nuisance call countermeasure device 11 returns the communication request to the SIP server 15 on the recipient side.

Step S6;
When the billing amount is determined in step S5, the nuisance call countermeasure device 11 (response unit 111) informs the telephone terminal 12 of the caller that if the call of the caller is evaluated as nuisance or fraud by the recipient, voices a response requesting the billing amount determined in step S5 (an amount corresponding to the probability of being evaluated as nuisance or fraud).

step S7 to step S10;
At this point, the caller knows that if his/her call is rated as annoying or fraudulent by the recipient, he/she will be charged an amount corresponding to the probability of being rated as annoying or fraudulent. Even if the amount is charged, the telephone terminal 12 on the caller side returns a communication request to the nuisance call countermeasure device 11 when making a call with the recipient. After that, the anti-nuisance call device 11 transfers the communication request to the SIP server 15 on the recipient side, and the SIP server 15 on the recipient side transfers the communication request to the telephone terminal 14 on the recipient side. After that, a call connection is established between the caller and the recipient, and the call becomes possible.

step S11 to step S13;
After the call with the recipient ends, the caller's telephone terminal 12 transmits a disconnection request (BYE signal) to the caller's SIP server 13 . The sender's SIP server 13 transfers the disconnection request to the receiver's SIP server 15, and the receiver's SIP server 15 transfers the disconnection request to the receiver's telephone terminal 14. FIG. At this timing, the call connection established between the caller and the recipient is disconnected.

Steps S14 to S16;
After transferring the disconnection request to the SIP server 15 on the recipient side in step S13, the SIP server 15 on the recipient side notifies the nuisance call countermeasure device 11 of the termination of the call between the caller and the recipient. When the nuisance call countermeasure device 11 (notification unit 112) receives the call termination notification, the device 11 (notification unit 112) notifies the telephone terminal 14 of the recipient of a request to return the evaluation result of evaluating the call with the caller. For example, the nuisance call countermeasure device 11 uses an existing SMS distribution function provided in the telephone communication network to determine whether the caller's call is nuisance (SPAM), fraud (crime), normal (nuisance), A screen for selecting whether it is not fraudulent or fraudulent) is displayed on the display screen provided by the SMS function of the telephone terminal 14 on the recipient's side.

At this time, the nuisance call countermeasure device 11 includes radio buttons for determining nuisance, fraud, options other than normal, the degree of nuisance, etc., and an input field for the recipient to enter the billing amount determined by himself/herself. may be displayed. In addition, the nuisance call countermeasure device 11 may further display a screen for selecting whether or not to charge when the call is evaluated as nuisance or fraud. After that, the telephone terminal 14 on the recipient's side transmits to the nuisance call countermeasure device 11 the response of the evaluation result of the call with the caller input by the recipient.

Step S17;
The nuisance call countermeasure device 11 (decision unit 114), when the call with the caller is evaluated as nuisance or fraud in the evaluation result from the recipient, instead of the conventional low and fixed billing amount (1 dollar) , an amount corresponding to the probability of being evaluated as nuisance or fraud is determined as the charge amount. A method for determining the amount will be described later.

step S18 to step S20;
The nuisance call countermeasure device 11 (transmitting unit 115) transmits the billing amount determined in step S17 together with the caller ID to the SIP server 15 on the recipient side. The SIP server 15 on the recipient side notifies the SIP server 13 on the sender side of the billing amount. The SIP server 13 on the caller side transmits bill data in which the billing amount is described to the telephone terminal 12 on the caller side.

[How to determine the amount charged]
In steps S5 and S17, when the call with the caller is evaluated as nuisance or fraud in the evaluation result from the recipient, the method of determining the billing amount determined by the nuisance call countermeasure device 11 (determining unit 114) will be explained. do.

[Method 1 for determining the charge amount]
The determination unit 114 determines p that satisfies (p×q)>r, where q is the probability of being evaluated as nuisance or fraud as the billing amount, and r is the expected income amount per nuisance or fraudulent call. decide. p is the amount depending on the probability of being evaluated as nuisance or fraud. Determining p that satisfies (p×q)>r reduces the incentive for fraudulent organizations to call and commit fraud. Data necessary for calculating q and r are stored in the storage unit 116 .

In determination method 1, the sender (fraudster side) is a, the recipient (evaluator side) is b, and r (ab) is the expected income value for recipient b held internally by sender a. Then, consider the problem of determining {p(ab)×q(ab)} in accordance with r(ab).

Normally, when a caller makes a fraudulent call for the presented billing amount (penalty), it is considered that it is better to commit fraud even if the caller receives a penalty, so {p (ab) × r(ab) is greater than q(ab)}. At this time, in order for the caller to decide that it is better not to commit fraud (it is better not to make a fraudulent call) in the case of the presented penalty, {p(ab) xq(ab)} should be increased.

Therefore, the determining unit 114 determines p(ab) that satisfies {p(ab)×q(ab)}>r(ab). Specifically, when a phone call is determined to be fraudulent, the determination unit 114 calculates a new q(ab) (hereinafter, q(ab)+1) based on the determination of fraud, and {p Raise {p(ab)+1} to be greater than (ab)*q(ab)}/{q(ab)+1}. Conversely, if the call is not determined to be fraudulent, the determination unit 114 calculates {q(ab)+1} and {p(ab)×q(ab)}/{q(ab)+1 Determine {p(ab)+1} to be less than }.

Note that q(ab) is calculated as follows. q(ab) is the probability of being evaluated as fraud as described above. In general, it is considered that the probability that a call is evaluated as fraud is low, and that the number of trials for which the probability of being evaluated as fraud is calculated is 0 in many cases. Therefore, when the number of trial calculations of q(ab) is small, or when the initial value of q(ab) is obtained, q(ab) is calculated based on the probability of q for other callers. For example, the determination unit 114 sets q(ab) ₀ , which is the initial value of q(ab), to q(ab) ₀ = {the total number of evaluations of the caller as fraudulent}/{the caller and other calls the total number of calls received from a person}.

Similarly, for p(ab), when the number of calculation trials is small, or when obtaining the initial value of q(ab), p(ab) is calculated based on the penalty values of other recipients. . For example, the determining unit 114 calculates p(ab) ₀ , which is the initial value of p(ab), by p(ab) ₀ =(average value of penalty values).

In addition, when calls are divided into fraud calls and nuisance calls, R (ab) is the expected income amount per fraud call, RT (ab) is the expected income amount per nuisance call, and fraud is QW (ab) is the probability of being evaluated, QT (ab) is the probability of being evaluated as annoying, PW (ab) is the charge amount (penalty) when evaluated as fraud, and PW (ab) is the charge amount when evaluated as annoying ( penalty) is PT(ab), determine PW(ab) and PT(ab) satisfying {QW(ab)×PW(ab)+QT(ab)×PT(ab)}>R(ab) . Specifically, similarly to the case where calls are not classified into fraudulent calls and nuisance calls, the determination unit 114 increases {QW(ab)×PW(ab)} when a call is determined to be fraudulent. and if the call is judged to be a nuisance, {QT(ab)*PT(ab)} is increased. Conversely, if the call is not determined to be fraud or nuisance, the decision unit 114 decreases {QW(ab)*PW(ab)} and {QT(ab)*PT(ab)} respectively. .

[Method 2 for determining the charge amount]
The determining unit 114 determines a different amount of money to be charged depending on whether the call with the caller is evaluated as a nuisance or a fraud in the evaluation result.

For example, the nuisance call countermeasure device 11 allows the recipient to select one of the three categories of nuisance (SPAM), fraud (crime), and normal (neither nuisance nor fraud) for the caller's call, and evaluates the call as nuisance. Determine a higher amount if you rate it as fraud than if you do. The nuisance call countermeasure device 11 sets different amounts in advance for each evaluation of nuisance and fraud in the storage unit 116, and the determination unit 114 determines the type of evaluation included in the evaluation result from the recipient. The corresponding amount is read out from storage unit 116 and determined as the billing amount. In addition, the determination unit 114 may set only the amount of money for the nuisance in the storage unit 116, and if the amount of nuisance is evaluated as nuisance, the value obtained by multiplying the amount of the nuisance by 1.5 may be determined as the billing amount. good.

[Method 3 of determining the charge amount]
The determination unit 114 performs risk analysis of the caller ID by statistical analysis using header information and the like included in the communication request transmitted from the telephone terminal 12 on the caller side as the billing amount, and obtains the analysis result of the risk analysis. Determine the amount based on

For example, the processing unit 113 calculates the total number of evaluations of nuisance, fraud, and normal for each sender ID and each recipient ID based on the evaluation results from each recipient. Then, if the ratio of the total number of nuisance or fraud evaluations to the total number of normal evaluations for the caller making the call is equal to or greater than a threshold, the determination unit 114 determines that the caller has a high risk, and the ratio is the threshold. If it is less than that, it is determined that the caller's risk is low. After that, the determination unit 114 determines a high amount of money when the risk of the caller is high, and determines a low amount of money when the risk of the caller is low.

In addition to the sender ID, the header information includes the receiver ID and the like. Regarding the above statistical analysis and risk analysis methods, in addition to the above specific examples, see H. Tu and three others, “SoK: Everyone Hates Robocalls: A Survey of Techniques against Telephone Spam,” 2016 IEEE Symposium on Security and Privacy, p. .320-p.338, <URL: https://oaklandsok.github.io/papers/tu2016.pdf>" may be used.

[Method 4 for determining the charge amount]
The determining unit 114 determines an amount to be charged according to the evaluation tendency of each of the receivers who evaluate the call with the caller as annoying, fraudulent, or normal. That is, the determining unit 114 performs statistical analysis on the evaluation of each recipient as annoying, fraudulent, and normal as the billing amount, and based on the statistical analysis of the evaluation of each recipient, The amount is determined by taking into consideration that it is easy to feel.

For example, when a communication request is received from the same caller as a past caller, and the evaluation result from the receiver is determined to be fraud, the amount determined by the determination unit 114 is evaluated as fraud by anyone. It is determined so that the amount determined when a recipient who hardly evaluates as fraud is judged as fraud is larger than the amount determined for the recipient. In other words, the determination unit 114 determines a low amount when any recipient tends to evaluate the amount as fraudulent, and determines a high amount when the recipient almost never evaluates as a fraud but evaluates as a fraud. determine the amount.

[Method 5 for determining the charge amount]
The determining unit 114 determines the amount to be charged, taking into account the status of the recipient's fraud damage. In other words, the determination unit 114 determines the amount of money to be charged, taking into account the amount of income (=r) expected for each recipient per annoying or fraudulent call.

For example, the nuisance call countermeasure device 11 presets in the storage unit 116 the amount of income (expected income value) of the caller that is expected per nuisance or fraudulent call, which differs for each recipient. . After that, the determination unit 114 reads the revenue amount of the sender corresponding to the recipient who transmitted the evaluation result from the storage unit 116 and determines the billing amount. The income amount of the caller from the nuisance or fraudulent call, which differs for each recipient, is set based on, for example, the recipient's region, income, and the like.

[Method 6 for determining the charge amount]
The determining unit 114 determines an amount corresponding to the issuance cost of the ID (telephone number) associated with the telephone terminal of the caller as the billing amount. That is, the determining unit 114 determines the initial value of the risk of the caller ID as the billing amount in consideration of the ID issuing cost in the risk analysis of the caller ID.

Normally, fraudsters and criminals, when the ID (caller ID) of their own phone terminal is given a bad evaluation or low evaluation such as nuisance or fraud, is given a bad evaluation or low evaluation as a countermeasure. There is a tendency to discard caller IDs and issue new caller IDs. However, if ID issuance costs are high, fraudsters and criminals are not likely to reissue IDs without hesitation.

Therefore, if the cost of issuing the caller ID included in the communication request is high, it is determined that the risk of the caller ID is low, and if the cost of issuing the caller ID is low, the risk of the caller ID is determined to be high. do. Then, when determining that the caller ID issuance cost is high and the risk of the caller ID is low, the determination unit 114 determines a low amount as the charge amount, and determines that the caller ID issuance cost is low and the caller ID When it is determined that the risk of the person ID is high, a large amount of money is determined as the billing amount. In particular, when the caller is a new caller, the information for determining the charge amount is insufficient. The value obtained by subtracting the caller ID issuing cost of the new caller is used as the initial charge amount.

The ID issuing cost is the initial cost (contract fee, facility installation charge, construction cost) required to issue a telephone number. In the case of a corporate contract, it is necessary to register a telephone number, so ID issuance costs include registration costs in addition to initial costs. The nuisance call countermeasure device 11 may store the issuance cost of each caller ID in advance in the storage unit 116, and each time a communication request is received from the caller's telephone terminal 12, the telephone company's management server You may acquire the issuing cost of the caller ID of the caller.

[Method 7 for determining the charge amount]
The determining unit 114 determines the billing amount using the amount determined by the recipient, regardless of the billing amount determination methods described in the determination methods 1 to 6 above.

For example, the nuisance call countermeasure device 11 makes the recipient respond with the evaluation result of the call, and makes the recipient enter the amount of money. The determination unit 114 respects the intention of the recipient and uses the amount entered by the recipient as the billing amount. At this time, the determining unit 114 may set the average of the billing amounts input by the plurality of recipients as the billing amount. In addition, the determining unit 114 may multiply each receiver by a predetermined weight according to the input tendency of each amount input by a plurality of receivers at a plurality of timings, and the average sum of the weights may be used as the billing amount. .

[effect]
According to this embodiment, when the caller's call is evaluated as annoying or fraudulent by the recipient, the probability that the caller's call is evaluated as annoying or fraudulent is and a response unit 111 that transmits a response that charges an amount corresponding to the request, and when the caller requests a call with the recipient in response to the response, a notification unit 112 for notifying the telephone terminal of the recipient of a request to return an evaluation result of evaluating the call with the caller; In this case, the determining unit 114 is provided for determining an amount corresponding to the probability of being evaluated as a nuisance or a fraud as the billing amount.

Further, according to the present embodiment, the determination unit 114, as the billing amount, the probability of being evaluated as nuisance or fraud is q, the amount corresponding to the probability of being evaluated as nuisance or fraud is p, nuisance or Assuming that the amount of revenue expected per fraudulent call is r, p that satisfies (p×q)>r is determined, so that it is possible to provide a technology that can more reliably prevent nuisance calls and fraudulent calls.

Further, according to the present embodiment, the determining unit 114 determines different amounts as the billing amount depending on whether the call with the caller is evaluated as annoying or fraudulent in the evaluation result. Therefore, it is possible to provide a technology capable of more reliably deterring nuisance calls and fraudulent calls.

In addition, according to the present embodiment, the determination unit 114 determines, as the billing amount, an amount according to the evaluation tendency of each of the receivers who evaluates the call with the caller as annoying, fraudulent, or normal. is determined, it is possible to provide a technology capable of more reliably deterring nuisance calls and fraudulent calls.

Further, according to the present embodiment, the determining unit 114 determines, as the billing amount, an amount corresponding to the issuance cost of the ID linked to the telephone terminal of the caller. It is possible to provide a more reliable deterrence technology.

[others]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention. For example, the charge amount may be determined by combining two or more of the determination methods 1 to 7 of the charge amount.

Further, the nuisance call countermeasure device 11 described in this embodiment, for example, as shown in FIG. A general-purpose computer system comprising a storage 903 such as a computer, a communication device 904, an input device 905, and an output device 906 can be used. Memory 902 and storage 903 are storage devices. In the computer system, CPU 901 executes a predetermined program loaded in memory 902 to realize each function of nuisance call countermeasure device 11 .

The anti-nuisance call device 11 may be implemented by one computer or may be implemented by a plurality of computers. Also, the anti-nuisance call device 11 may be a virtual machine implemented in a computer. The program for the anti-nuisance call device 11 can also be stored in computer-readable recording media such as HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), DVD (Digital Versatile Disc), and the like. Yes, it can also be distributed over a communication network.

1: Nuisance call countermeasure system 11: Nuisance call countermeasure device 12: Caller's phone terminal 13: Caller's SIP server 14: Recipient's phone terminal 15: Recipient's SIP server 111: Responder 112: Notification unit 113: processing unit 114: determination unit 115: transmission unit 116: storage unit 901: CPU
902: Memory 903: Storage 904: Communication device 905: Input device 906: Output device

Claims (7)

a response unit that transmits a response to the caller's telephone terminal, charging an amount corresponding to the probability of the call being evaluated as nuisance or fraud if the caller's call is evaluated as nuisance or fraud by the recipient;
When the caller requests a call with the recipient in response to the response, after the call between the caller and the recipient is completed, the telephone terminal of the recipient is requested to talk with the caller. a notification unit that notifies a request to return an evaluation result of evaluating a call;
a determination unit that determines, as a charge amount, an amount corresponding to the probability that the call with the caller is evaluated as annoying or fraudulent in the evaluation result;
anti-nuisance call device. The decision unit
As the billing amount, the probability of being evaluated as nuisance or fraud is q, the amount corresponding to the probability of being evaluated as nuisance or fraud is p, and the amount of income expected per nuisance or fraudulent call is r. 2. A nuisance call countermeasure device according to claim 1, wherein p that satisfies (p.times.q)>r is determined. The decision unit
2. The nuisance call countermeasure device according to claim 1, wherein different amounts are determined as the billing amount depending on whether the call with the caller is evaluated as nuisance or fraud in the evaluation result. The decision unit
2. A nuisance call countermeasure device according to claim 1, wherein said billing amount is determined according to the tendency of each recipient to evaluate the call with the caller as nuisance, fraud, or normal by a plurality of recipients. The decision unit
2. The anti-nuisance call countermeasure device according to claim 1, wherein the billing amount is determined according to the issuance cost of the ID linked to the telephone terminal of the caller. In the nuisance call countermeasure method performed by the nuisance call countermeasure device,
The anti-nuisance call device is
transmitting a response to a caller's telephone terminal charging an amount commensurate with the probability of being rated as nuisance or fraud if the caller's call is rated as nuisance or fraud by a recipient;
When the caller requests a call with the recipient in response to the response, after the call between the caller and the recipient is completed, the telephone terminal of the recipient is requested to talk with the caller. a step of notifying a request to return evaluation results of evaluating the call;
If the call with the caller is evaluated as nuisance or fraud in the evaluation result, determining an amount corresponding to the probability of being evaluated as nuisance or fraud as the billing amount;
anti-nuisance call method. 6. A nuisance call countermeasure program that causes a computer to function as the nuisance call countermeasure device according to any one of claims 1 to 5.

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